Newton’s Laws of
Motion &
Acceleration
JEOPARDY
An object’s inertia
is dependent on
this.
Its mass
Seatbelts reduce force by
increasing stopping time
therefore decreasing
what?
Acceleration
F=mxa
if “a” is smaller, then
Force is smaller.
A seatbelt acts as the
unbalanced force stopping
your forward motion due
to what?
Inertia
If acceleration stayed
constant and mass
increased, what would
happen to the Force?
Force increases
A construction worker lifts a
45-kg bundle of shingles on
his shoulder at an
acceleration of 3 m/s². How
much force is he using?
135 N of force
A golf ball is still on
top of a tee. Mr. Feys
hits it and it flies into
the pond. Mr. Feys’
swing is considered
this type of force.
An unbalanced
force
A dragster racing down a
road, a rocket launching
and a balloon being let go
in the classroom are ALL
examples of this.
Newton’s
rd
3
Law of Motion
or
Unbalanced forces
or
Action/Reaction Forces
A 500-kg car is using a
force of 15,000 N to move.
What is its acceleration?
30 m/s/s
Mr. Ameel and his family went
to Boyne Mountain for the
weekend. They traveled in a
straight line at 80 mi/hr at 0
acceleration (he used his cruise
control). What was his net force
on the car?
0 Newtons
Because there was NO
acceleration
The mass and
distance between
two objects will
determine this.
The amount of
gravitational force.
This type of force will
be felt when a car
rounds a curve on the
road or you ride a
merry-go-round.
Centripetal Force
Mrs. Braniff threw a dodge
ball at a person. She noticed
that it followed a curved
path before it hit. Explain
what caused the ball’s curve
to happen.
The throw gave it a
forward/horizontal motion
and gravity gave it a
downward/vertical motion.
How much does a 45 kg
person weigh on Earth?
W= 45 kg x 9.8 m/s2
W = 441 N
This would occur to an
astronaut because the
moon has less mass
than the Earth.
A person would weigh
less.
This type of force allows
the moon to orbit around
the Earth and the other
planets to orbit around the
Sun.
Centripetal Force
Mrs. Poloney drops a 15 LB
rock and a 20LB from the roof
of her house. Identify the
rock that would cause the
deepest hole when it hit the
ground.
The 20 LB rock due to
its larger mass.
An object in free fall
would have this type of
downward force.
Gravity
This object would have the
LEAST amount of inertia.
A.
B.
C.
D.
train
sports car
space shuttle
bicycle
A bicycle
(less mass of all of the vehicles)
A boat is using 6000 N
of force to tow a skier
with an acceleration of
12 m/s². Identify the
skier’s mass.
500-kg
Jack’s bike front tire hits
a raised portion of the
sidewalk causing him to
flip over and hit the
ground. Why????
Jack’s inertia
or
The bike stops & Jack’s
body still moves forward
or
The crack is an
unbalanced force
If forces are unbalanced
what will happen to an
object?
The object
will accelerate.
Why is rolling friction
weaker than sliding
friction?
Less surface area touches
when an object is on
wheels therefore fewer
microwelds form.
According to Newton’s 3rd
law of motion, if forces
are equal in size and
opposite in direction, why
does motion occur?
The forces don’t cancel,
they act on different
objects.
When an object reaches
terminal velocity, what
happens to its motion?
The object
will fall with a constant
velocity, it will stop
accelerating.
th
8
st
1
If an
grader and a
grader went sky diving,
who would hit the ground
first and why?
th
8
The
grader will hit the
ground first because they
reached a higher terminal
velocity due to the larger
mass.
Balanced or Unbalanced?
Balanced
The car is NOT moving
Balanced or Unbalanced?
Unbalanced
The tennis ball changes
its motion when hit by the
racket.
STUDY!!
The test is
tomorrow!!